Rich and poor countries are in this together. If either fails to step up, the planet is in trouble. A climate deal must take into account the Global North’s responsibility for nearly 70 percent of greenhouse pollution and the Global South’s need to move out of poverty. The North must cut back sharply on emissions while the South leapfrogs over the industrial age to clean-energy prosperity.

Kumi Naidoo is building a global movement to force world leaders to adopt a binding agreement on climate change. He is executive director of Greenpeace International and chairs TckTckTck, a global campaign for climate action.